diff --git a/src/adapters.rs b/src/adapters.rs
index c2c4729..30af5ca 100644
--- a/src/adapters.rs
+++ b/src/adapters.rs
@@ -53,7 +53,10 @@ pub trait GetMetadata {
     fn metadata(&self) -> &AdapterMeta;
 }
 pub trait FileAdapter: GetMetadata {
-    fn adapt(&self, a: AdaptInfo) -> Fallible<()>;
+    /// adapt a file.
+    ///
+    /// detection_reason is the Matcher that was used to identify this file. Unless --rga-accurate was given, it is always a FastMatcher
+    fn adapt(&self, a: AdaptInfo, detection_reason: &SlowMatcher) -> Fallible<()>;
 }
 pub struct AdaptInfo<'a> {
     /// file path. May not be an actual file on the file system (e.g. in an archive). Used for matching file extensions.
@@ -72,7 +75,10 @@ pub struct AdaptInfo<'a> {
     pub config: PreprocConfig<'a>,
 }
 
-pub fn get_all_adapters() -> (Vec<Rc<dyn FileAdapter>>, Vec<Rc<dyn FileAdapter>>) {
+/// (enabledAdapters, disabledAdapters)
+type AdaptersTuple = (Vec<Rc<dyn FileAdapter>>, Vec<Rc<dyn FileAdapter>>);
+
+pub fn get_all_adapters() -> AdaptersTuple {
     // order in descending priority
     let enabled_adapters: Vec<Rc<dyn FileAdapter>> = vec![
         Rc::new(ffmpeg::FFmpegAdapter::new()),
@@ -96,7 +102,7 @@ pub fn get_all_adapters() -> (Vec<Rc<dyn FileAdapter>>, Vec<Rc<dyn FileAdapter>>
  *  - "" means use default enabled adapter list
  *  - "a,b" means use adapters a,b
  *  - "-a,b" means use default list except for a and b
- *  - "+a,b" means use default list but also a and b
+ *  - "+a,b" means use default list but also a and b (a,b will be prepended to the list so given higher priority)
  */
 pub fn get_adapters_filtered<T: AsRef<str>>(
     adapter_names: &[T],
diff --git a/src/adapters/decompress.rs b/src/adapters/decompress.rs
index 0902d66..141f0da 100644
--- a/src/adapters/decompress.rs
+++ b/src/adapters/decompress.rs
@@ -79,7 +79,7 @@ fn get_inner_filename(filename: &Path) -> PathBuf {
 }
 
 impl FileAdapter for DecompressAdapter {
-    fn adapt(&self, ai: AdaptInfo) -> Fallible<()> {
+    fn adapt(&self, ai: AdaptInfo, detection_reason: &SlowMatcher) -> Fallible<()> {
         let AdaptInfo {
             filepath_hint,
             mut inp,
diff --git a/src/adapters/ffmpeg.rs b/src/adapters/ffmpeg.rs
index 8ccc89d..3649e59 100644
--- a/src/adapters/ffmpeg.rs
+++ b/src/adapters/ffmpeg.rs
@@ -47,7 +47,7 @@ struct FFprobeStream {
     codec_type: String, // video,audio,subtitle
 }
 impl FileAdapter for FFmpegAdapter {
-    fn adapt(&self, ai: AdaptInfo) -> Fallible<()> {
+    fn adapt(&self, ai: AdaptInfo, detection_reason: &SlowMatcher) -> Fallible<()> {
         let AdaptInfo {
             is_real_file,
             filepath_hint,
diff --git a/src/adapters/pdfpages.rs b/src/adapters/pdfpages.rs
index 13d7bbc..346ea6f 100644
--- a/src/adapters/pdfpages.rs
+++ b/src/adapters/pdfpages.rs
@@ -42,7 +42,7 @@ impl GetMetadata for PdfPagesAdapter {
 /// A pdf is basically converted to a zip that has Page X.png files.
 /// This way, something like tesseract can process the pages individually
 impl FileAdapter for PdfPagesAdapter {
-	fn adapt(&self, ai: AdaptInfo) -> Fallible<()> {
+	fn adapt(&self, ai: AdaptInfo, detection_reason: &SlowMatcher) -> Fallible<()> {
 		let AdaptInfo {
 			filepath_hint,
 			is_real_file,
diff --git a/src/adapters/spawning.rs b/src/adapters/spawning.rs
index 726617a..8c446f3 100644
--- a/src/adapters/spawning.rs
+++ b/src/adapters/spawning.rs
@@ -93,7 +93,7 @@ impl<T> FileAdapter for T
 where
     T: SpawningFileAdapter,
 {
-    fn adapt(&self, ai: AdaptInfo) -> Fallible<()> {
+    fn adapt(&self, ai: AdaptInfo, detection_reason: &SlowMatcher) -> Fallible<()> {
         let AdaptInfo {
             filepath_hint,
             mut inp,
diff --git a/src/adapters/sqlite.rs b/src/adapters/sqlite.rs
index 74cbe0c..ba9d66f 100644
--- a/src/adapters/sqlite.rs
+++ b/src/adapters/sqlite.rs
@@ -56,7 +56,7 @@ fn format_blob(b: ValueRef) -> String {
 }
 
 impl FileAdapter for SqliteAdapter {
-    fn adapt(&self, ai: AdaptInfo) -> Fallible<()> {
+    fn adapt(&self, ai: AdaptInfo, detection_reason: &SlowMatcher) -> Fallible<()> {
         let AdaptInfo {
             is_real_file,
             filepath_hint,
diff --git a/src/adapters/tar.rs b/src/adapters/tar.rs
index acd03d5..d490d00 100644
--- a/src/adapters/tar.rs
+++ b/src/adapters/tar.rs
@@ -35,7 +35,7 @@ impl GetMetadata for TarAdapter {
 }
 
 impl FileAdapter for TarAdapter {
-    fn adapt(&self, ai: AdaptInfo) -> Fallible<()> {
+    fn adapt(&self, ai: AdaptInfo, detection_reason: &SlowMatcher) -> Fallible<()> {
         let AdaptInfo {
             filepath_hint,
             mut inp,
diff --git a/src/adapters/zip.rs b/src/adapters/zip.rs
index 8e6befd..e9bcba5 100644
--- a/src/adapters/zip.rs
+++ b/src/adapters/zip.rs
@@ -45,7 +45,7 @@ fn is_dir(f: &ZipFile) -> bool {
 }
 
 impl FileAdapter for ZipAdapter {
-    fn adapt(&self, ai: AdaptInfo) -> Fallible<()> {
+    fn adapt(&self, ai: AdaptInfo, detection_reason: &SlowMatcher) -> Fallible<()> {
         let AdaptInfo {
             filepath_hint,
             mut inp,
diff --git a/src/matching.rs b/src/matching.rs
index 2e10aa7..22b84c7 100644
--- a/src/matching.rs
+++ b/src/matching.rs
@@ -7,8 +7,6 @@ use failure::*;
 
 use regex::{Regex, RegexSet};
 
-
-
 use std::iter::Iterator;
 
 use std::rc::Rc;
@@ -50,7 +48,7 @@ pub fn extension_to_regex(extension: &str) -> Regex {
 pub fn adapter_matcher<T: AsRef<str>>(
 	adapter_names: &[T],
 	slow: bool,
-) -> Fallible<impl Fn(FileMeta) -> Option<Rc<dyn FileAdapter>>> {
+) -> Fallible<impl Fn(FileMeta) -> Option<(Rc<dyn FileAdapter>, SlowMatcher)>> {
 	let adapters = get_adapters_filtered(adapter_names)?;
 	// need order later
 	let adapter_names: Vec<String> = adapters.iter().map(|e| e.metadata().name.clone()).collect();
@@ -61,9 +59,9 @@ pub fn adapter_matcher<T: AsRef<str>>(
 		use SlowMatcher::*;
 		for matcher in metadata.get_matchers(slow) {
 			match matcher.as_ref() {
-				MimeType(re) => mime_regexes.push((re.clone(), adapter.clone())),
-				Fast(FastMatcher::FileExtension(re)) => {
-					fname_regexes.push((extension_to_regex(re), adapter.clone()))
+				f @ MimeType(re) => mime_regexes.push((re.clone(), adapter.clone(), f)),
+				f @ Fast(FastMatcher::FileExtension(re)) => {
+					fname_regexes.push((extension_to_regex(re), adapter.clone(), f))
 				}
 			};
 		}
@@ -85,15 +83,20 @@ pub fn adapter_matcher<T: AsRef<str>>(
 		};
 		if fname_matches.len() + mime_matches.len() > 1 {
 			// get first according to original priority list...
-			let fa = fname_matches.iter().map(|e| fname_regexes[*e].1.clone());
-			let fb = mime_matches.iter().map(|e| mime_regexes[*e].1.clone());
+			// todo: kinda ugly
+			let fa = fname_matches
+				.iter()
+				.map(|e| (fname_regexes[*e].1.clone(), fname_regexes[*e].2.clone()));
+			let fb = mime_matches
+				.iter()
+				.map(|e| (mime_regexes[*e].1.clone(), mime_regexes[*e].2.clone()));
 			let mut v = vec![];
 			v.extend(fa);
 			v.extend(fb);
 			v.sort_by_key(|e| {
 				(adapter_names
 					.iter()
-					.position(|r| r == &e.metadata().name)
+					.position(|r| r == &e.0.metadata().name)
 					.expect("impossib7"))
 			});
 			eprintln!(
@@ -101,7 +104,7 @@ pub fn adapter_matcher<T: AsRef<str>>(
 				meta.lossy_filename
 			);
 			for mmatch in v.iter() {
-				eprintln!(" - {}", mmatch.metadata().name);
+				eprintln!(" - {}", mmatch.0.metadata().name);
 			}
 			return Some(v[0].clone());
 		}
@@ -109,10 +112,12 @@ pub fn adapter_matcher<T: AsRef<str>>(
 			if fname_matches.is_empty() {
 				None
 			} else {
-				Some(fname_regexes[fname_matches[0]].1.clone())
+				let (_, adapter, matcher) = fname_regexes[fname_matches[0]];
+				Some((adapter.clone(), matcher.clone()))
 			}
 		} else {
-			Some(mime_regexes[mime_matches[0]].1.clone())
+			let (_, adapter, matcher) = mime_regexes[mime_matches[0]];
+			Some((adapter.clone(), matcher.clone()))
 		}
 	})
 }
diff --git a/src/preproc.rs b/src/preproc.rs
index 9cb7b2e..a29bd4c 100644
--- a/src/preproc.rs
+++ b/src/preproc.rs
@@ -63,8 +63,8 @@ pub fn rga_preproc(ai: AdaptInfo) -> Result<(), Error> {
         lossy_filename: filename.to_string_lossy().to_string(),
     });
     match adapter {
-        Some(ad) => {
-            let meta = ad.metadata();
+        Some((adapter, detection_reason)) => {
+            let meta = adapter.metadata();
             eprintln!("adapter: {}", &meta.name);
             let db_name = format!("{}.v{}", meta.name, meta.version);
             if let Some(cache) = cache.as_mut() {
@@ -91,15 +91,18 @@ pub fn rga_preproc(ai: AdaptInfo) -> Result<(), Error> {
                             args.cache_compression_level.try_into().unwrap(),
                         )?);
                         eprintln!("adapting...");
-                        ad.adapt(AdaptInfo {
-                            line_prefix,
-                            filepath_hint,
-                            is_real_file,
-                            inp,
-                            oup: &mut compbuf,
-                            archive_recursion_depth,
-                            config: PreprocConfig { cache: None, args },
-                        })?;
+                        adapter.adapt(
+                            AdaptInfo {
+                                line_prefix,
+                                filepath_hint,
+                                is_real_file,
+                                inp,
+                                oup: &mut compbuf,
+                                archive_recursion_depth,
+                                config: PreprocConfig { cache: None, args },
+                            },
+                            detection_reason,
+                        )?;
                         let compressed = compbuf
                             .into_inner()
                             .map_err(|_| "could not finish zstd")
@@ -121,15 +124,18 @@ pub fn rga_preproc(ai: AdaptInfo) -> Result<(), Error> {
                 Ok(())
             } else {
                 eprintln!("adapting...");
-                ad.adapt(AdaptInfo {
-                    line_prefix,
-                    filepath_hint,
-                    is_real_file,
-                    inp,
-                    oup,
-                    archive_recursion_depth,
-                    config: PreprocConfig { cache: None, args },
-                })?;
+                adapter.adapt(
+                    AdaptInfo {
+                        line_prefix,
+                        filepath_hint,
+                        is_real_file,
+                        inp,
+                        oup,
+                        archive_recursion_depth,
+                        config: PreprocConfig { cache: None, args },
+                    },
+                    detection_reason,
+                )?;
                 Ok(())
             }
         }