thodg/libgit2

diff --git a/include/git2/config.h b/include/git2/config.h
index d812e16..d9da65b 100644
--- a/include/git2/config.h
+++ b/include/git2/config.h
@@ -401,6 +401,10 @@ GIT_EXTERN(int) git_config_get_string_buf(git_buf *out, const git_config *cfg, c
  *
  * The callback will be called on each variable found
  *
+ * The regular expression is applied case-sensitively on the normalized form of
+ * the variable name: the section and variable parts are lower-cased. The
+ * subsection is left unchanged.
+ *
  * @param cfg where to look for the variable
  * @param name the variable's name
  * @param regexp regular expression to filter which variables we're
@@ -413,6 +417,10 @@ GIT_EXTERN(int) git_config_get_multivar_foreach(const git_config *cfg, const cha
 /**
  * Get each value of a multivar
  *
+ * The regular expression is applied case-sensitively on the normalized form of
+ * the variable name: the section and variable parts are lower-cased. The
+ * subsection is left unchanged.
+ *
  * @param out pointer to store the iterator
  * @param cfg where to look for the variable
  * @param name the variable's name
@@ -490,6 +498,8 @@ GIT_EXTERN(int) git_config_set_string(git_config *cfg, const char *name, const c
 /**
  * Set a multivar in the local config file.
  *
+ * The regular expression is applied case-sensitively on the value.
+ *
  * @param cfg where to look for the variable
  * @param name the variable's name
  * @param regexp a regular expression to indicate which values to replace
@@ -509,6 +519,8 @@ GIT_EXTERN(int) git_config_delete_entry(git_config *cfg, const char *name);
 /**
  * Deletes one or several entries from a multivar in the local config file.
  *
+ * The regular expression is applied case-sensitively on the value.
+ *
  * @param cfg where to look for the variables
  * @param name the variable's name
  * @param regexp a regular expression to indicate which values to delete
@@ -555,6 +567,10 @@ GIT_EXTERN(int) git_config_iterator_new(git_config_iterator **out, const git_con
  * Use `git_config_next` to advance the iteration and
  * `git_config_iterator_free` when done.
  *
+ * The regular expression is applied case-sensitively on the normalized form of
+ * the variable name: the section and variable parts are lower-cased. The
+ * subsection is left unchanged.
+ *
  * @param out pointer to store the iterator
  * @param cfg where to ge the variables from
  * @param regexp regular expression to match the names
@@ -568,8 +584,12 @@ GIT_EXTERN(int) git_config_iterator_glob_new(git_config_iterator **out, const gi
  * regular expression that filters which config keys are passed to the
  * callback.
  *
- * The pointers passed to the callback are only valid as long as the
- * iteration is ongoing.
+ * The regular expression is applied case-sensitively on the normalized form of
+ * the variable name: the section and variable parts are lower-cased. The
+ * subsection is left unchanged.
+ *
+ * The regular expression is applied case-sensitively on the normalized form of
+ * the variable name: the case-insensitive parts are lower-case.
  *
  * @param cfg where to get the variables from
  * @param regexp regular expression to match against config names
@@ -696,6 +716,10 @@ GIT_EXTERN(int) git_config_parse_path(git_buf *out, const char *value);
  * This behaviors like `git_config_foreach_match` except instead of all config
  * entries it just enumerates through the given backend entry.
  *
+ * The regular expression is applied case-sensitively on the normalized form of
+ * the variable name: the section and variable parts are lower-cased. The
+ * subsection is left unchanged.
+ *
  * @param backend where to get the variables from
  * @param regexp regular expression to match against config names (can be NULL)
  * @param callback the function to call on each variable