diff --git a/aimeio/aimeio.c b/aimeio/aimeio.c
index b0f2e24..b09d612 100644
--- a/aimeio/aimeio.c
+++ b/aimeio/aimeio.c
@@ -162,6 +162,11 @@ static HRESULT aime_io_generate_felica(
     return S_OK;
 }
 
+uint16_t aime_io_get_api_version(void)
+{
+    return 0x0100;
+}
+
 HRESULT aime_io_init(void)
 {
     aime_io_config_read(&aime_io_cfg, L".\\segatools.ini");
diff --git a/aimeio/aimeio.h b/aimeio/aimeio.h
index e8ceaca..221f8e0 100644
--- a/aimeio/aimeio.h
+++ b/aimeio/aimeio.h
@@ -5,9 +5,22 @@
 #include <stddef.h>
 #include <stdint.h>
 
+/*
+    Get the version of the Aime IO API that this DLL supports. This function
+    should return a positive 16-bit integer, where the high byte is the major
+    version and the low byte is the minor version (as defined by the Semantic
+    Versioning standard).
+
+    The latest API version as of this writing is 0x0100.
+ */
+uint16_t aime_io_get_api_version(void);
+
 /*
     Initialize Aime IO provider DLL. Only called once, before any other
-    functions exported from this DLL are called.
+    functions exported from this DLL are called (except for
+    aime_io_get_api_version).
+
+    Minimum API version: 0x0100
  */
 HRESULT aime_io_init(void);
 
@@ -15,6 +28,8 @@ HRESULT aime_io_init(void);
     Poll for IC cards in the vicinity.
 
     - unit_no: Always 0 as of the current API version
+
+    Minimum API version: 0x0100
  */
 HRESULT aime_io_nfc_poll(uint8_t unit_no);
 
@@ -30,6 +45,8 @@ HRESULT aime_io_nfc_poll(uint8_t unit_no);
     - S_OK if a classic Aime is present and was read successfully
     - S_FALSE if no classic Aime card is present (*luid will be ignored)
     - Any HRESULT error if an error occured.
+
+    Minimum API version: 0x0100
 */
 HRESULT aime_io_nfc_get_aime_id(
         uint8_t unit_no,
@@ -54,6 +71,8 @@ HRESULT aime_io_nfc_get_aime_id(
     - S_OK if a FeliCa device is present and was read successfully
     - S_FALSE if no FeliCa device is present (*IDm will be ignored)
     - Any HRESULT error if an error occured.
+
+    Minimum API version: 0x0100
 */
 HRESULT aime_io_nfc_get_felica_id(uint8_t unit_no, uint64_t *IDm);
 
@@ -62,5 +81,7 @@ HRESULT aime_io_nfc_get_felica_id(uint8_t unit_no, uint64_t *IDm);
 
     - unit_no: Always 0 as of the current API version
     - r, g, b: Primary color intensity, from 0 to 255 inclusive.
+
+    Minimum API version: 0x0100
 */
 void aime_io_led_set_color(uint8_t unit_no, uint8_t r, uint8_t g, uint8_t b);