diff --git a/aider/website/assets/sample.aider.conf.yml b/aider/website/assets/sample.aider.conf.yml
index 31088fecc..48d7ed7d1 100644
--- a/aider/website/assets/sample.aider.conf.yml
+++ b/aider/website/assets/sample.aider.conf.yml
@@ -206,6 +206,9 @@
 ## specify a file to edit (can be used multiple times)
 #file:
 
+## specify a read-only file (can be used multiple times)
+#read:
+
 ## Use VI editing mode in the terminal (default: False)
 #vim: false
 
diff --git a/aider/website/assets/sample.env b/aider/website/assets/sample.env
index 56708a188..90afaec04 100644
--- a/aider/website/assets/sample.env
+++ b/aider/website/assets/sample.env
@@ -210,6 +210,9 @@
 ## specify a file to edit (can be used multiple times)
 #AIDER_FILE=
 
+## specify a read-only file (can be used multiple times)
+#AIDER_READ=
+
 ## Use VI editing mode in the terminal (default: False)
 #AIDER_VIM=false
 
diff --git a/aider/website/docs/config/aider_conf.md b/aider/website/docs/config/aider_conf.md
index 3f6c1e40a..8f090ec4a 100644
--- a/aider/website/docs/config/aider_conf.md
+++ b/aider/website/docs/config/aider_conf.md
@@ -245,6 +245,9 @@ cog.outl("```")
 ## specify a file to edit (can be used multiple times)
 #file:
 
+## specify a read-only file (can be used multiple times)
+#read:
+
 ## Use VI editing mode in the terminal (default: False)
 #vim: false
 
diff --git a/aider/website/docs/config/dotenv.md b/aider/website/docs/config/dotenv.md
index 493b123db..b12fa9a3e 100644
--- a/aider/website/docs/config/dotenv.md
+++ b/aider/website/docs/config/dotenv.md
@@ -252,6 +252,9 @@ cog.outl("```")
 ## specify a file to edit (can be used multiple times)
 #AIDER_FILE=
 
+## specify a read-only file (can be used multiple times)
+#AIDER_READ=
+
 ## Use VI editing mode in the terminal (default: False)
 #AIDER_VIM=false
 
diff --git a/aider/website/docs/config/options.md b/aider/website/docs/config/options.md
index 1c6428b24..c35273f3d 100644
--- a/aider/website/docs/config/options.md
+++ b/aider/website/docs/config/options.md
@@ -51,8 +51,8 @@ usage: aider [-h] [--openai-api-key] [--anthropic-api-key] [--model]
              [--commit] [--commit-prompt] [--dry-run | --no-dry-run]
              [--lint] [--lint-cmd] [--auto-lint | --no-auto-lint]
              [--test-cmd] [--auto-test | --no-auto-test] [--test]
-             [--file] [--vim] [--voice-language] [--version]
-             [--just-check-update]
+             [--file] [--read] [--vim] [--voice-language]
+             [--version] [--just-check-update]
              [--check-update | --no-check-update] [--apply] [--yes]
              [-v] [--show-repo-map] [--show-prompts] [--exit]
              [--message] [--message-file] [--encoding] [-c] [--gui]
@@ -396,6 +396,10 @@ Environment variable: `AIDER_TEST`
 specify a file to edit (can be used multiple times)  
 Environment variable: `AIDER_FILE`  
 
+### `--read FILE`
+specify a read-only file (can be used multiple times)  
+Environment variable: `AIDER_READ`  
+
 ### `--vim`
 Use VI editing mode in the terminal (default: False)  
 Default: False  
diff --git a/aider/website/docs/usage/commands.md b/aider/website/docs/usage/commands.md
index 576cc3085..d17274800 100644
--- a/aider/website/docs/usage/commands.md
+++ b/aider/website/docs/usage/commands.md
@@ -31,6 +31,7 @@ cog.out(get_help_md())
 | **/model** | Switch to a new LLM |
 | **/models** | Search the list of available models |
 | **/quit** | Exit the application |
+| **/read** | Load a file from anywhere and add it to abs_read_only_fnames |
 | **/run** | Run a shell command and optionally add the output to the chat (alias: !) |
 | **/test** | Run a shell command and add the output to the chat on non-zero exit code |
 | **/tokens** | Report on the number of tokens used by the current chat context |