thodg/libgit2

diff --git a/include/git2/version.h b/include/git2/version.h
index ad36eb5..84af817 100644
--- a/include/git2/version.h
+++ b/include/git2/version.h
@@ -7,13 +7,33 @@
 #ifndef INCLUDE_git_version_h__
 #define INCLUDE_git_version_h__
 
+/**
+ * The version string for libgit2.  This string follows semantic
+ * versioning (v2) guidelines.
+ */
 #define LIBGIT2_VERSION        "1.5.0-alpha"
+
+/** The major version number for this version of libgit2. */
 #define LIBGIT2_VER_MAJOR      1
+
+/** The minor version number for this version of libgit2. */
 #define LIBGIT2_VER_MINOR      5
+
+/** The revision ("teeny") version number for this version of libgit2. */
 #define LIBGIT2_VER_REVISION   0
+
+/** The Windows DLL patch number for this version of libgit2. */
 #define LIBGIT2_VER_PATCH      0
+
+/**
+ * The prerelease string for this version of libgit2.  For development
+ * (nightly) builds, this will be "alpha".  For prereleases, this will be
+ * a prerelease name like "beta" or "rc1".  For final releases, this will
+ * be `NULL`.
+ */
 #define LIBGIT2_VER_PRERELEASE "alpha"
 
+/** The library ABI soversion for this version of libgit2. */
 #define LIBGIT2_SOVERSION      "1.5"
 
 #endif