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diff --git a/docs/content/doc/advanced/config-cheat-sheet.en-us.md b/docs/content/doc/advanced/config-cheat-sheet.en-us.md
index 10c6110f37..e8251350fd 100644
--- a/docs/content/doc/advanced/config-cheat-sheet.en-us.md
+++ b/docs/content/doc/advanced/config-cheat-sheet.en-us.md
@@ -181,6 +181,8 @@ Values containing `#` or `;` must be quoted using `` ` `` or `"""`.
 
 - `REPO_INDEXER_ENABLED`: **false**: Enables code search (uses a lot of disk space, about 6 times more than the repository size).
 - `REPO_INDEXER_PATH`: **indexers/repos.bleve**: Index file used for code search.
+- `REPO_INDEXER_INCLUDE`: **empty**: A comma separated list of glob patterns (see https://github.com/gobwas/glob) to **include** in the index. Use `**.txt` to match any files with .txt extension. An empty list means include all files.
+- `REPO_INDEXER_EXCLUDE`: **empty**: A comma separated list of glob patterns (see https://github.com/gobwas/glob) to **exclude** from the index. Files that match this list will not be indexed, even if they match in `REPO_INDEXER_INCLUDE`.
 - `UPDATE_BUFFER_LEN`: **20**: Buffer length of index request.
 - `MAX_FILE_SIZE`: **1048576**: Maximum size in bytes of files to be indexed.
 
diff --git a/docs/content/doc/advanced/repo-indexer.en-us.md b/docs/content/doc/advanced/repo-indexer.en-us.md
new file mode 100644
index 0000000000..66f09df939
--- /dev/null
+++ b/docs/content/doc/advanced/repo-indexer.en-us.md
@@ -0,0 +1,58 @@
+---
+date: "2019-09-06T01:35:00-03:00"
+title: "Repository indexer"
+slug: "repo-indexer"
+weight: 45
+toc: true
+draft: false
+menu:
+  sidebar:
+    parent: "advanced"
+    name: "Repository indexer"
+    weight: 45
+    identifier: "repo-indexer"
+---
+
+# Repository indexer
+
+## Setting up the repository indexer
+
+Gitea can search through the files of the repositories by enabling this function in your [`app.ini`](https://docs.gitea.io/en-us/config-cheat-sheet/):
+
+```
+[indexer]
+; ...
+REPO_INDEXER_ENABLED = true
+REPO_INDEXER_PATH = indexers/repos.bleve
+UPDATE_BUFFER_LEN = 20
+MAX_FILE_SIZE = 1048576
+REPO_INDEXER_INCLUDE =
+REPO_INDEXER_EXCLUDE = resources/bin/**
+```
+
+Please bear in mind that indexing the contents can consume a lot of system resources, especially when the index is created for the first time or globally updated (e.g. after upgrading Gitea).
+
+### Choosing the files for indexing by size
+
+The `MAX_FILE_SIZE` option will make the indexer skip all files larger than the specified value.
+
+### Choosing the files for indexing by path
+
+Gitea applies glob pattern matching from the [`gobwas/glob` library](https://github.com/gobwas/glob) to choose which files will be included in the index.
+
+Limiting the list of files prevents the indexes from becoming polluted with derived or irrelevant files (e.g. lss, sym, map, etc.), so the search results are more relevant. It can also help reduce the index size.
+
+`REPO_INDEXER_INCLUDE` (default: empty) is a comma separated list of glob patterns to **include** in the index. An empty list means "_include all files_".
+`REPO_INDEXER_EXCLUDE` (default: empty) is a comma separated list of glob patterns to **exclude** from the index. Files that match this list will not be indexed. `REPO_INDEXER_EXCLUDE` takes precedence over `REPO_INDEXER_INCLUDE`.
+
+Pattern matching works as follows:
+
+* To match all files with a `.txt` extension no matter what directory, use `**.txt`.
+* To match all files with a `.txt` extension _only at the root level of the repository_, use `*.txt`.
+* To match all files inside `resources/bin` and below, use `resources/bin/**`.
+* To match all files _immediately inside_ `resources/bin`, use `resources/bin/*`.
+* To match all files named `Makefile`, use `**Makefile`.
+* Matching a directory has no effect; the pattern `resources/bin` will not include/exclude files inside that directory; `resources/bin/**` will.
+* All files and patterns are normalized to lower case, so `**Makefile`, `**makefile` and `**MAKEFILE` are equivalent.
+
+