diff --git a/README.md b/README.md
index 1148ed5..52d2b8f 100644
--- a/README.md
+++ b/README.md
@@ -16,3 +16,41 @@ Run TimeSheetGenerator (requires Java 8 or higher):
 |  `-v`  | `--version` | _none_                                  | Print the version of the application.                          |
 |  `-g`  |   `--gui`   | _none_                                  | Generate an output file based on files chosen in a file dialog.|
 |  `-f`  |  `--file`   |`<global.json> <month.json> <output.tex>`| Generate an output file based on the given files.              |
+
+## Input Files
+
+For now only JSON files are supported.
+
+### Global Time Sheet Definition
+
+| Property    | Type         | Description                                                                                                |
+| ----------- | ------------ | ---------------------------------------------------------------------------------------------------------- |
+| name        | String       | Name of the employee.                                                                                      |
+| staffId     | Integer      | Staff ID of the employee.                                                                                  |
+| department  | String       | Department where the employee is employed at.                                                              |
+| workingTime | TimeSpan     | Maximum allowed working time per month according to the employment contract.                               |
+| wage        | Decimal      | Wage per hour according to the employment contract.                                                        |
+| workingArea | {"ub","gf"} | Working area of the employee; either "ub" (= "Universitaetsbereich") or "gf" (= "Grossforschungsbereich"). |
+
+### Monthly Working Time Recording
+
+| Property      | Type      | Description                                                                                  |
+| ------------- | --------- | -------------------------------------------------------------------------------------------- |
+| year          | Integer   | Year for which the working time is recorded.                                                 |
+| month         | Integer   | Month for which the working time is recorded.                                                |
+| pred_transfer | TimeSpan  | Working time transfer, in hours, from the preceding month. *(default: 0:00)*              |
+| succ_transfer | TimeSpan  | Working time transfer, in hours, to the succeeding month. *(default: 0:00)*                  |
+| entries       | [Entries] | Array of entries, where each entry represent a continual period of working or vacation time. |
+
+#### Monthly Working Time Entry
+
+| Property | Type      | Description                                                                      |
+| -------- | --------- | -------------------------------------------------------------------------------- |
+| action   | String    | Description of the actions performed in this period of working or vacation time. |
+| day      | Integer   | Day of the month.                                                                |
+| start    | ClockTime | Starting time for the period of working or vacation time in 24-hour format.      |
+| end      | ClockTime | Ending time for the period of working or vacation time in 24-hour format.        |
+| pause    | TimeSpan  | Combined pause time during the period of working time. *(default: 0:00)*         |
+| vacation | Boolean   | If the recorded period of time represents vacation time. *(default: False)*      |
+
+*Note that the pause and the vacation property may not both be present.*