diff --git a/README.md b/README.md
index adb8c62..0d93040 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,7 @@ Those sets provide the following indices:
 |                     | `C9`                  | Daily magnetic index on Cp basis                                   |                     |
 |                     | `ISN`                 | International sunspot number                                       |                     |
 |                     | `BSRN`                | Bartels solar rotation number                                      |                     |
-|                     | `ND`                  | Number of Days into Bartels Solar Rotation Cycle                   | Days                |
+|                     | `ND`                  | Number of days into Bartels solar rotation cycle                   | Days                |
 | `JB2008`            | `DTC`                 | Exospheric temperature variation caused by the Dst index           | K                   |
 |                     | `S10`                 | EUV index (26-34 nm) scaled to F10.7                               | 10⁻²² W / (M² ⋅ Hz) |
 |                     | `M10`                 | MG2 index scaled to F10.7                                          | 10⁻²² W / (M² ⋅ Hz) |
diff --git a/docs/src/man/get.md b/docs/src/man/get.md
index 1375b46..4e9f133 100644
--- a/docs/src/man/get.md
+++ b/docs/src/man/get.md
@@ -48,7 +48,7 @@ The following space indices are currently supported:
 |                     | `C9`                  | Daily magnetic index on Cp basis                                   |                     |
 |                     | `ISN`                 | International sunspot number                                       |                     |
 |                     | `BSRN`                | Bartels solar rotation number                                      |                     |
-|                     | `ND`                  | Number of Days into Bartels Solar Rotation Cycle                   | Days                |
+|                     | `ND`                  | Number of days into Bartels solar rotation cycle                   | Days                |
 | `JB2008`            | `DTC`                 | Exospheric temperature variation caused by the Dst index           | K                   |
 |                     | `S10`                 | EUV index (26-34 nm) scaled to F10.7                               | 10⁻²² W / (M² ⋅ Hz) |
 |                     | `M10`                 | MG2 index scaled to F10.7                                          | 10⁻²² W / (M² ⋅ Hz) |